[Acute bilateral loss of vision in posterior reversible encephalopathy syndrome].

We describe the case of a patient from the emergency ophthalmic clinic who presented with sudden, bilateral visual loss, headache and dizziness. The magnetic resonance imaging (MRI) showed bilateral parieto-occipital vasogenic edema of the white and grey brain matter consistent with the diagnosis of posterior reversible encephalopathy syndrome (PRES). This is a rare cause of sudden bilateral visual loss which describes a condition with bilateral edema of primarily the white but also the grey matter.